Rental Units- Carpet Stain

[Mak K.]

I have a rental unit where the carpet is all good except for 2-3 spots where there are few stains. These were from previous owner. I did had a professional deep clean the carpet but they could not remove the stain.

The new tenant opened a request for carpet stain. I do not think I should be changing the carpet as its all good other than  the few small stains.  The house is not a high end luxury area. Its a average day to day community where most of the houses are on lease. 

How should I respond to this? Is it ok to tell tenant that stains are ok and not a valid request. How should I word the refusal in the email.